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    <title>Document</title>
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    <script>
        function combine() {
            let arr = [].concat.apply([], arguments);  //没有去重复的新数组
            return Array.from(new Set(arr));
        }

        var m = [1, 2, 2], n = [2, 3, 3];
        console.log(combine(m, n));  // [1, 2, 3]
    </script>
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